Chemical Identification
Common Name
Methoxychlor
中文通用名
甲氧滴滴涕
IUPAC
1,1,1-trichloro-2,2-bis(4-methoxyphenyl)ethane
CAS
1,1′-(2,2,2-trichloroethylidene)bis[4-methoxybenzene]
CAS No.
72-43-5
Molecular Formula
C16H15Cl3O2
Molecular Structure
Physical Properties
Molecular weight:345.7; Physical form:Colourless crystals; ( tech., grey powder). Density:1.41 (25 °C); Composition:Tech. grade contains ×88% methoxychlor and ×12% related isomers. Melting point:89 °C; ( tech., 77 °C); Vapour pressure:Very low; Solubility:In water 0.1 mg/l (25 °C). Readily soluble in aromatic, chlorinated, and ketonic solvents, and vegetable oils. In chloroform and xylene 440, methanol 50 (all in g/kg, 22 °C).; Stability:Stable to oxidising agents and to u.v. irradiation. Reacts with alkalis, especially in the presence of catalytically-active metals, with loss of hydrogen chloride, but more slowly than DDT. Colour turns to pink or tan on exposure to light;
Toxicology
Oral:Acute oral LD50 for rats 6000 mg/ kg. Percutaneous:Acute percutaneous LD50 for rabbits >2000 mg/ kg; not a skin irritant. ADI:( JMPR) 0.1 mg/ kg b.w. [1987].
Environmental Profile
Ecotoxicology: 
Birds:Acute oral LD50 for mallard ducks >2000 mg/kg. Dietary LC50 (8 d) for bobwhite quail and ring-necked pheasants >5000 mg/ kg diet.Daphnia: LC50 (48 h) 0.00078 mg/l.Fish: LC50 (24 h) for rainbow trout 0.052, bluegill sunfish 0.067 mg/l. 

Environmental fate: 
Animals:Degradation in animals is principally by O-dealkylation to the corresponding phenol and diphenol, and by dehydrochlorination to 4,4'-dihydroxybenzophenone (K. S. Kapoor, J. Agric. Food Chem., 1970, 18, 1145-1152; J. Soil: DT50 in water c. 46 d.
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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